tetrahedron 4, hexahedron (cube) 6, octohedron (diamond) 8, dodecahedron 12 and icosahedron 20.
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There are many. All polyhedra have ONLY flat faces but many other shapes have flat faces such as a hemisphere or an octant or a cylinder.
A polyhedron.
There are any number of shapes without flat faces including: > circle > ellipse > blob
Yes and its flat surface faces are in regular shapes.
The flat side so the solid that lays flat without moving.